@article{KunkelGebhardtMpofuetal.2019,
  author    = {Kunkel, Maximilian Hugo and Gebhardt, Andreas and Mpofu, Khumbulani and Kallweit, Stephan},
  title     = {Quality assurance in metal powder bed fusion via deep-learning-based image classification},
  series = {Rapid Prototyping Journal},
  volume    = {26},
  journal   = {Rapid Prototyping Journal},
  number    = {2},
  issn      = {1355-2546},
  doi       = {10.1108/RPJ-03-2019-0066},
  pages     = {259 -- 266},
  year      = {2019},
  language  = {en}
}
@article{RaffeisAdjeiKyeremehVroomenetal.2020,
  author    = {Raffeis, Iris and Adjei-Kyeremeh, Frank and Vroomen, Uwe and Westhoff, Elmar and Bremen, Sebastian and Hohoi, Alexandru and B{\"u}hrig-Polaczek, Andreas},
  title     = {Qualification of a Ni-Cu alloy for the laser powder bed fusion process (LPBF): Its microstructure and mechanical properties},
  series = {Applied Sciences},
  volume    = {10},
  journal   = {Applied Sciences},
  number    = {Art. 3401},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2076-3417},
  doi       = {10.3390/app10103401},
  pages     = {1 -- 15},
  year      = {2020},
  abstract  = {As researchers continue to seek the expansion of the material base for additive manufacturing, there is a need to focus attention on the Ni-Cu group of alloys which conventionally has wide industrial applications. In this work, the G-NiCu30Nb casting alloy, a variant of the Monel family of alloys with Nb and high Si content is, for the first time, processed via the laser powder bed fusion process (LPBF). Being novel to the LPBF processes, optimum LPBF parameters were determined, and hardness and tensile tests were performed in as-built conditions and after heat treatment at 1000 °C. Microstructures of the as-cast and the as-built condition were compared. Highly dense samples (99.8\% density) were achieved after varying hatch distance (80 µm and 140 µm) with scanning speed (550 mm/s-1500 mm/s). There was no significant difference in microhardness between varied hatch distance print sets. Microhardness of the as-built condition (247 HV0.2) exceeded the as-cast microhardness (179 HV0.2.). Tensile specimens built in vertical (V) and horizontal (H) orientations revealed degrees of anisotropy and were superior to conventionally reported figures. Post heat treatment increased ductility from 20\% to 31\% (V), as well as from 16\% to 25\% (H), while ultimate tensile strength (UTS) and yield strength (YS) were considerably reduced.},
  language  = {en}
}
@inproceedings{BraunChengDoweyetal.2020,
  author    = {Braun, Sebastian and Cheng, Chi-Tsun and Dowey, Steve and Wollert, J{\"o}rg},
  title     = {Survey on Security Concepts to Adapt Flexible Manufacturing and Operations Management based upon Multi-Agent Systems},
  series = {2020 IEEE 29th International Symposium on Industrial Electronics (ISIE)},
  booktitle = {2020 IEEE 29th International Symposium on Industrial Electronics (ISIE)},
  doi       = {10.1109/ISIE45063.2020.9152210},
  year      = {2020},
  language  = {en}
}
@article{FrankoDuKallweitetal.2020,
  author    = {Franko, Josef and Du, Shengzhi and Kallweit, Stephan and Duelberg, Enno Sebastian and Engemann, Heiko},
  title     = {Design of a Multi-Robot System for Wind Turbine Maintenance},
  series = {Energies},
  volume    = {13},
  journal   = {Energies},
  number    = {10},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {1996-1073},
  doi       = {10.3390/en13102552},
  pages     = {Article 2552},
  year      = {2020},
  abstract  = {The maintenance of wind turbines is of growing importance considering the transition to renewable energy. This paper presents a multi-robot-approach for automated wind turbine maintenance including a novel climbing robot. Currently, wind turbine maintenance remains a manual task, which is monotonous, dangerous, and also physically demanding due to the large scale of wind turbines. Technical climbers are required to work at significant heights, even in bad weather conditions. Furthermore, a skilled labor force with sufficient knowledge in repairing fiber composite material is rare. Autonomous mobile systems enable the digitization of the maintenance process. They can be designed for weather-independent operations. This work contributes to the development and experimental validation of a maintenance system consisting of multiple robotic platforms for a variety of tasks, such as wind turbine tower and rotor blade service. In this work, multicopters with vision and LiDAR sensors for global inspection are used to guide slower climbing robots. Light-weight magnetic climbers with surface contact were used to analyze structure parts with non-destructive inspection methods and to locally repair smaller defects. Localization was enabled by adapting odometry for conical-shaped surfaces considering additional navigation sensors. Magnets were suitable for steel towers to clamp onto the surface. A friction-based climbing ring robot (SMART— Scanning, Monitoring, Analyzing, Repair and Transportation) completed the set-up for higher payload. The maintenance period could be extended by using weather-proofed maintenance robots. The multi-robot-system was running the Robot Operating System (ROS). Additionally, first steps towards machine learning would enable maintenance staff to use pattern classification for fault diagnosis in order to operate safely from the ground in the future.},
  language  = {en}
}
@article{CosmaKesslerGebhardtetal.2020,
  author    = {Cosma, Cosmin and Kessler, Julia and Gebhardt, Andreas and Campbell, Ian and Balc, Nicolae},
  title     = {Improving the Mechanical Strength of Dental Applications and Lattice Structures SLM Processed},
  series = {Materials},
  volume    = {13},
  journal   = {Materials},
  number    = {4},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {1996-1944},
  doi       = {10.3390/ma13040905},
  pages     = {1 -- 18},
  year      = {2020},
  abstract  = {To manufacture custom medical parts or scaffolds with reduced defects and high mechanical characteristics, new research on optimizing the selective laser melting (SLM) parameters are needed. In this work, a biocompatible powder, 316L stainless steel, is characterized to understand the particle size, distribution, shape and flowability. Examination revealed that the 316L particles are smooth, nearly spherical, their mean diameter is 39.09 μm and just 10\% of them hold a diameter less than 21.18 μm. SLM parameters under consideration include laser power up to 200 W, 250-1500 mm/s scanning speed, 80 μm hatch spacing, 35 μm layer thickness and a preheated platform. The effect of these on processability is evaluated. More than 100 samples are SLM-manufactured with different process parameters. The tensile results show that is possible to raise the ultimate tensile strength up to 840 MPa, adapting the SLM parameters for a stable processability, avoiding the technological defects caused by residual stress. Correlating with other recent studies on SLM technology, the tensile strength is 20\% improved. To validate the SLM parameters and conditions established, complex bioengineering applications such as dental bridges and macro-porous grafts are SLM-processed, demonstrating the potential to manufacture medical products with increased mechanical resistance made of 316L.},
  language  = {en}
}
@inproceedings{BraunChengLaietal.2019,
  author    = {Braun, Sebastian and Cheng, Chi-Tsun and Lai, Chow Yin and Wollert, J{\"o}rg},
  title     = {Microservice Architecture for Automation - Realization by the example of a model-factory's manufacturing execution system},
  series = {Proceedings of the 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  booktitle = {Proceedings of the 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  pages     = {33 -- 37},
  year      = {2019},
  language  = {en}
}
@inproceedings{GerhardsSchleserOtten2019,
  author    = {Gerhards, Benjamin and Schleser, Markus and Otten, Christian},
  title     = {Advancements of mobile vacuum laser welding for industrial thick sheet applications},
  series = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  booktitle = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  pages     = {1 -- 8},
  year      = {2019},
  language  = {en}
}
@inproceedings{GerhardsSchleserOttenetal.2019,
  author    = {Gerhards, Benjamin and Schleser, Markus and Otten,, Christian and Schwarz, Alexander and Gebhardt, Andreas},
  title     = {Innovative Laser Beam Joining Technology for Additive Manufactured Parts},
  series = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  booktitle = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  pages     = {1 -- 8},
  year      = {2019},
  language  = {en}
}
@inproceedings{EichlerSkupinThurnetal.2019,
  author    = {Eichler, Fabian and Skupin, Marco and Thurn, Laura and Kasch, Susanne and Schmidt, Thomas},
  title     = {Operating limits for beam melting of glass materials},
  series = {Modern Technologies in Manufacturing (MTeM 2019)},
  volume    = {299},
  booktitle = {Modern Technologies in Manufacturing (MTeM 2019)},
  number    = {Article 01004},
  doi       = {10.1051/matecconf/201929901004},
  pages     = {8 Seiten},
  year      = {2019},
  abstract  = {Laser-based Additive Manufacturing (AM) processes for the use of metals out of the powder bed have been investigated profusely and are prevalent in industry. Although there is a broad field of application, Laser Powder Bed Fusion (LPBF), also known as Selective Laser Melting (SLM) of glass is not fully developed yet. The material properties of glass are significantly different from the investigated metallic material for LPBF so far. As such, the process cannot be transferred, and the parameter limits and the process sequence must be redefined for glass. Starting with the characterization of glass powders, a parameter field is initially confined to investigate the process parameter of different glass powder using LPBFprocess. A feasibility study is carried out to process borosilicate glass powder. The effects of process parameters on the dimensional accuracy of fabricated parts out of borosilicate and hints for the post-processing are analysed and presented in this paper.},
  language  = {en}
}
@inproceedings{AbbasThurnKessleretal.2019,
  author    = {Abbas, Karim and Thurn, Laura and Kessler, Julia and Eichler, Fabian},
  title     = {Basic research of the consideration of additive manufactured lattice structures under thermoand fluid dynamic loads},
  series = {Modern technologies in manufacturing (MTeM 2019)},
  volume    = {299},
  booktitle = {Modern technologies in manufacturing (MTeM 2019)},
  number    = {Article 01009},
  doi       = {10.1051/matecconf/201929901009},
  pages     = {8 Seiten},
  year      = {2019},
  language  = {en}
}
@inproceedings{LuftGebhardtBalc2019,
  author    = {Luft, Angela and Gebhardt, Andreas and Balc, Nicolae},
  title     = {Challenges of additive manufacturing in production systems},
  series = {Modern technologies in manufacturing (MTeM 2019)},
  volume    = {299},
  booktitle = {Modern technologies in manufacturing (MTeM 2019)},
  number    = {Article 01003},
  doi       = {10.1051/matecconf/201929901003},
  pages     = {6 Seiten},
  year      = {2019},
  language  = {en}
}
@article{PancContiuBocanetetal.2019,
  author    = {Panc, Nicolae and Contiu, Glad and Bocanet, Vlad and Thurn, Laura and Sabau, Emilia},
  title     = {The influence of cutting technology on surface wear hardness},
  series = {Academic Journal of Manufacturing Engineering},
  volume    = {17},
  journal   = {Academic Journal of Manufacturing Engineering},
  number    = {3},
  issn      = {1583-7904},
  pages     = {205 -- 210},
  year      = {2019},
  language  = {en}
}
@inproceedings{UlmerBraunLaietal.2019,
  author    = {Ulmer, Jessica and Braun, Sebastian and Lai, Chow Yin and Cheng, Chi-Tsun and Wollert, J{\"o}rg},
  title     = {Generic integration of VR and AR in product lifecycles based on CAD models},
  series = {Proceedings of The 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  booktitle = {Proceedings of The 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  year      = {2019},
  language  = {en}
}
@article{BucurLazarescuPopetal.2019,
  author    = {Bucur, Alexandru and Lazarescu, Lucian and Pop, Grigore Marian and Achimas, Gheorghe and Gebhardt, Andreas},
  title     = {Tribological performance of biodegradable lubricants under different surface roughness of tools},
  series = {Academic Journal of Manufacturing Engineering},
  volume    = {17},
  journal   = {Academic Journal of Manufacturing Engineering},
  number    = {1},
  issn      = {1583-7904},
  pages     = {172 -- 178},
  year      = {2019},
  language  = {en}
}
@article{SchwarzGebhardtSchleseretal.2019,
  author    = {Schwarz, Alexander and Gebhardt, Andreas and Schleser, Markus and Popoola, Patricia},
  title     = {New Welding Joint Geometries Manufactured by Powder Bed Fusion from 316L},
  series = {Materials Performance and Characterization 8},
  journal   = {Materials Performance and Characterization 8},
  number    = {in press},
  issn      = {2379-1365},
  doi       = {10.1520/MPC20180096},
  year      = {2019},
  language  = {en}
}
@inproceedings{EngemannBadriWenningetal.2019,
  author    = {Engemann, Heiko and Badri, Sriram and Wenning, Marius and Kallweit, Stephan},
  title     = {Implementation of an Autonomous Tool Trolley in a Production Line},
  series = {Advances in Service and Industrial Robotics. RAAD 2019. Advances in Intelligent Systems and Computing, vol 980},
  booktitle = {Advances in Service and Industrial Robotics. RAAD 2019. Advances in Intelligent Systems and Computing, vol 980},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-19648-6},
  doi       = {10.1007/978-3-030-19648-6_14},
  pages     = {117 -- 125},
  year      = {2019},
  language  = {en}
}
@inproceedings{RieperGebhardtStucker2016,
  author    = {Rieper, Harald and Gebhardt, Andreas and Stucker, Brent},
  title     = {Process parameters for Selective Laser Melting of AgCu7},
  series = {DDMC, Fraunhofer Direct Digital Manufacturing Conference, 3},
  booktitle = {DDMC, Fraunhofer Direct Digital Manufacturing Conference, 3},
  publisher = {Fraunhofer-Verlag},
  address   = {Stuttgart},
  isbn      = {978-3-8396-1001-5},
  pages     = {171 -- 176},
  year      = {2016},
  language  = {en}
}
@incollection{FranzenSteckenPfaffetal.2019,
  author    = {Franzen, Julian and Stecken, Jannis and Pfaff, Raphael and Kuhlenk{\"o}tter, Bernd},
  title     = {Using the Digital Shadow for a Prescriptive Optimization of Maintenance and Operation : The Locomotive in the Context of the Cyber-Physical System},
  series = {Advances in Production, Logistics and Traffic},
  booktitle = {Advances in Production, Logistics and Traffic},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-13535-5},
  doi       = {10.1007/978-3-030-13535-5_19},
  pages     = {265 -- 276},
  year      = {2019},
  abstract  = {In competition with other modes of transport, rail freight transport is looking for solutions to become more attractive. Short-term success can be achieved through the data-driven optimization of operations and maintenance as well as the application of novel strategies such as prescriptive maintenance. After introducing the concept of prescriptive maintenance, this paper aims to prove that vehicle-focused applications of this approach indeed have the potential to increase attractiveness. However, even greater advantages can be activated if data from the horizontal network of the vehicle is available. Drawing on the state of the art in research and technology in the field of cyber-physical systems (CPS) as well as digital twins and shadows, our work serves to design a system of systems for the horizontal interconnection of a rail vehicle and to conceptualize a draft for a digital twin of a locomotive.},
  language  = {en}
}
@inproceedings{WiesenEngemannLimpertetal.2018,
  author    = {Wiesen, Patrick and Engemann, Heiko and Limpert, Nicolas and Kallweit, Stephan},
  title     = {Learning by Doing - Mobile Robotics in the FH Aachen ROS Summer School},
  series = {European Robotics Forum 2018, TRROS18 Workshop},
  booktitle = {European Robotics Forum 2018, TRROS18 Workshop},
  pages     = {47 -- 58},
  year      = {2018},
  language  = {en}
}
@inproceedings{PfaffMelcherFranzen2018,
  author    = {Pfaff, Raphael and Melcher, Karin and Franzen, Julian},
  title     = {Rare event simulation to optimise maintenance intervals of safety critical redundant subsystems},
  series = {Proceedings of the European Conference of the PHM Society},
  volume    = {4},
  booktitle = {Proceedings of the European Conference of the PHM Society},
  number    = {1},
  pages     = {1 -- 6},
  year      = {2018},
  language  = {en}
}